﻿ON 
  THE 
  CAMBRIAN 
  AND 
  SILT7PJAN 
  ROCKS 
  OF 
  SCANDINAVIA, 
  313 
  

  

  32. 
  — 
  On 
  the 
  Cambrian 
  (Sedgw.) 
  and 
  Silurian 
  Hocks 
  of 
  Scan- 
  

   dinavia. 
  By 
  J, 
  E. 
  Marr, 
  Esq., 
  B.A., 
  F.G.S 
  * 
  (Head 
  April 
  5, 
  

  

  1882.) 
  

  

  Contents. 
  

  

  1. 
  Introduction. 
  

  

  2. 
  Description 
  of 
  the 
  strata. 
  

  

  3. 
  Comparison 
  of 
  the 
  strata 
  with 
  the 
  British 
  and 
  Bohemian 
  deposits, 
  

  

  4. 
  Migrations 
  of 
  the 
  faunas. 
  

  

  5. 
  Summary. 
  

  

  § 
  1. 
  Introduction. 
  

  

  The 
  Cambrian 
  and 
  Silurian 
  rocks 
  of 
  Scandinavia 
  occur 
  in 
  isolated 
  

   patches 
  among 
  the 
  older 
  granites 
  and 
  gneisses 
  of 
  the 
  peninsula 
  ; 
  but 
  

   the 
  various 
  strata 
  of 
  these 
  patches 
  have 
  been 
  correlated 
  by 
  many 
  

   geologists 
  (notably 
  by 
  the 
  late 
  Dr. 
  G. 
  Linnarsson) 
  ; 
  for 
  their 
  

   Uthological 
  characters 
  continue 
  nearly 
  unaltered 
  over 
  many 
  thousand 
  

   ;piiare 
  miles 
  of 
  ground. 
  The 
  strata 
  are 
  generally 
  very 
  little 
  

   disturbed 
  and 
  faulted 
  (an 
  exception 
  to 
  this 
  statement 
  must, 
  however, 
  

   be 
  made 
  in 
  the 
  case 
  of 
  the 
  Dalecarlian 
  beds), 
  and 
  cleavage 
  is 
  very 
  

   exceptional 
  ; 
  hence 
  the 
  organic 
  remains 
  are 
  usually 
  well 
  preserved. 
  

   The 
  great 
  interest 
  of 
  the 
  latter 
  is 
  due 
  to 
  the 
  fact 
  that 
  many 
  of 
  

   them 
  are 
  found 
  in 
  shallow-water 
  beds, 
  deposited 
  at 
  periods 
  when 
  

   the 
  greater 
  part 
  of 
  the 
  North-western 
  European 
  area 
  was 
  covered 
  

   with 
  deep 
  water. 
  

  

  In 
  a 
  paper 
  read 
  before 
  the 
  Society 
  on 
  the 
  ninth 
  of 
  June 
  1880, 
  

   whilst 
  the 
  "Colonies" 
  theory 
  of 
  M. 
  Barrande 
  was 
  considered 
  at 
  

   some 
  length, 
  I 
  merely 
  referred 
  to 
  the 
  instances 
  of 
  migration 
  shown 
  

   by 
  the 
  eminent 
  palaeontologist 
  to 
  have 
  occurred 
  in 
  the 
  Bohemian 
  

   area. 
  In 
  the 
  present 
  communication 
  I 
  intend 
  to 
  treat 
  more 
  of 
  the 
  

   phenomena 
  of 
  migrations; 
  and 
  as 
  these, 
  unlike 
  the 
  Bohemian 
  

   " 
  colonies," 
  lend 
  support 
  to 
  the 
  nomenclature 
  of 
  Prof. 
  Sedgwick, 
  his 
  

   classification 
  of 
  the 
  Cambrian 
  and 
  Silurian 
  rocks 
  is 
  here 
  adopted. 
  

  

  My 
  hearty 
  thanks 
  are 
  due 
  to 
  many 
  geologists, 
  among 
  whom 
  I 
  

   may 
  mention 
  Dr. 
  Sven 
  Tornqvist 
  (under 
  whose 
  guidance 
  I 
  visited 
  

   the 
  principal 
  sections 
  of 
  Dalecarlia), 
  Prof. 
  Lindstrom 
  (for 
  kind 
  

   assistance 
  in 
  the 
  Museum 
  of 
  the 
  Academy 
  of 
  Science, 
  Stockholm), 
  

   Air. 
  Brogger 
  of 
  Christiania, 
  Prof. 
  Johnstrup 
  of 
  Copenhagen, 
  Prof. 
  

   Lundgren 
  of 
  Lund, 
  and 
  Dr. 
  Tullberg. 
  My 
  thanks 
  are 
  again 
  due 
  to 
  

   Profs. 
  Hughes 
  and 
  Bonney 
  for 
  much 
  kind 
  assistance. 
  

  

  § 
  2. 
  Desertion 
  of 
  the 
  Strata. 
  

  

  It 
  will 
  be 
  most 
  convenient 
  to 
  describe 
  separately 
  the 
  strata 
  of 
  the 
  

   different 
  areas 
  which 
  I 
  have 
  examined, 
  in 
  the 
  order 
  in 
  which 
  they 
  

  

  * 
  [The 
  author 
  gratefully 
  acknowledges 
  a 
  second 
  grant 
  from 
  the 
  Worts 
  

   Travelling 
  Scholars' 
  Fund 
  of 
  the 
  University 
  of 
  Cambridge, 
  " 
  to 
  enable 
  him 
  to 
  

   travel 
  in 
  Norway, 
  Sweden, 
  and 
  the 
  islands 
  of 
  the 
  Baltic, 
  and 
  collect 
  evidence 
  

   and 
  specimens 
  bearing 
  upon 
  the 
  question 
  of 
  the 
  classification 
  of 
  the 
  Cambrian 
  

   and 
  Silurian 
  Koeks" 
  (Grace 
  Z, 
  Apr. 
  15th, 
  1880).] 
  

  

  